Partial success

[Seth]

I was under the impresion that the MR2 s/c had bypass loop, but I am
most likely wrong.  I can't see why a turbo style blow off valve(s)
wouldn't work if is blow thru, other than wearing them out (quickly?).
They will be open a lot longer than normal (most of the time) whereas
with a turbo, they just deal with wheel/ gas column inertia on overrun.
But it will cost HP during cruise to blow all that air around the engine
compartment. Sounds like a suck thru s/c, bypass loop, or s/c clutch
might be another way to go.  

For crude results, a full throttle solenoid closed throttle plate that
controls the bypass loop?

-Seth

dzorde at erggroup.com wrote:
> 
> Hooray, I've finally got my Fiat 850 sport running on fuel injection,
> however I'm now in need of some suggestions for the next part.  I have a
> Toyota MR2 s/c connected in a blow through configuration with the throttle
> body (it should be geared for 120kPa full boost, 17psi), my problem as it
> stands:
> 
> At idle the ecu reads a vacuum (-21kPa to be exact) while the s/c side is
> seeing 90kPa (throttle blade shut).  At higher revs (no load) the boost
> will build up even more (over 250kPa) as the throttle is only just opening.
> Obviously if I keep going like this the s/c is likely to blow a seal
> somewhere.
> Now here's my question, do I just fit a blow off valve and let it bleed of
> any excess boost above say 140kPa ?
> And what sort of blow off valve would I use, the ones I have seen on turbo
> cars are very small and the s/c has like a 62mm outlet, so that is a lot of
> air to remove ?
> I have looked at a few available blow off valves (greddy, hks, etc), but
> they are all specced as turbo applications, isn't there anything for s/c
> applications ?
> 
> I'd appreciate any light people can shed on this unknown area I've ventured
> into.
> 
> Dan  dzorde at erggroup.com
> 
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